/*
 * Copyright 2010-2016 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jetbrains.uast.kotlin

import com.intellij.psi.PsiElement
import org.jetbrains.kotlin.psi.KtReturnExpression
import org.jetbrains.uast.*
import org.jetbrains.uast.kotlin.expressions.KotlinLocalFunctionULambdaExpression
import org.jetbrains.uast.kotlin.internal.KotlinFakeUElement
import org.jetbrains.uast.kotlin.internal.toSourcePsiFakeAware

class KotlinUReturnExpression(
    override val sourcePsi: KtReturnExpression,
    givenParent: UElement?
) : KotlinAbstractUExpression(givenParent), UReturnExpression, KotlinUElementWithType {
    override val returnExpression by lz { KotlinConverter.convertOrNull(sourcePsi.returnedExpression, this) }

    override val label: String?
        get() = sourcePsi.getTargetLabel()?.getReferencedName()

    override val jumpTarget: UElement?
        get() = generateSequence(uastParent) { it.uastParent }
            .find {
                it is ULabeledExpression && it.label == label ||
                        (it is UMethod || it is KotlinLocalFunctionULambdaExpression) && label == null ||
                        it is ULambdaExpression && it.uastParent.let { parent -> parent is UCallExpression && parent.methodName == label }
            }
}

class KotlinUImplicitReturnExpression(
    givenParent: UElement?
) : KotlinAbstractUExpression(givenParent), UReturnExpression, KotlinUElementWithType, KotlinFakeUElement {
    override val psi: PsiElement?
        get() = null

    override lateinit var returnExpression: UExpression
        internal set

    override fun unwrapToSourcePsi(): List<PsiElement> {
        return returnExpression.toSourcePsiFakeAware()
    }

}